linux-kernel - Re: [regression] 3.7+ suspend to RAM/offline CPU fails with nmi

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Message-ID: <alpine.LFD.2.02.1211231033230.2701@ionos>
Date:	Fri, 23 Nov 2012 10:33:54 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Norbert Warmuth <nwarmuth@...nline.de>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [regression] 3.7+ suspend to RAM/offline CPU fails with
 nmi_watchdog=0 (bisected)

On Wed, 21 Nov 2012, Norbert Warmuth wrote:
> 3.7-rc6 booted with nmi_watchdog=0 fails to suspend to RAM or
> offline CPUs. It's reproducable with a KVM guest and physical
> system. 

Does the patch below fix it?

Thanks,

	tglx

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 9d4c8d5..e3ef521 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -368,6 +368,9 @@ static void watchdog_disable(unsigned int cpu)
 {
 	struct hrtimer *hrtimer = &__raw_get_cpu_var(watchdog_hrtimer);
 
+	if (!watchdog_enabled)
+		return;
+
 	watchdog_set_prio(SCHED_NORMAL, 0);
 	hrtimer_cancel(hrtimer);
 	/* disable the perf event */
--
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